Archivio Journal of Plant Pathology

Abstract:

Alfalfa mosaic virus (AMV) is of sporadic occurrence in tomato crops. More recently, important epidemics caused by AMV have been reported in fieldgrown canning tomatoes in southern Italy. Since no lines or commercial varieties resistant to AMV are available, we have studied the inheritance of resistance to this virus, derived from the accession of Lycopersicon hirsutum f. glabratum PI 134417. A necrogenic tomato isolate of AMV was used as source of inoculum. Visual observations of symptoms and enzyme-linked immunosorbent assay (ELISA) were used to screen plants after mechanical inoculation. All the F1 tested were resistant while the segregation ratios of F2 and BC1 generations were consistent with a simple dominant inheritance. We propose tentatively to name this gene Am.